bug#12464: 24.2.50; nt/configure.bat fails to detect giflib-5.0.0

[Kazuhiro Ito]

> > Because gif_lib.h of giflib-5.0.0 assumes size_t is defined (I don't
> > know whether that is intended), nt/configure.bat fails to check its
> > availability.
> > 
> > In nt/config.log
> > > In file included from junk.c:1:0:
> > > f:/build/emacs-w32/include/gif_lib.h:262:37: error: expected ';', ',' or 
> > > ')' before 'GifExtensionLength'
> > > f:/build/emacs-w32/include/gif_lib.h:265:8: error: expected '=', ',', 
> > > ';', 'asm' or '__attribute__' before 'EGifGCBToExtension'
> > > The failed program was: 
> > > #include "gif_lib.h" 
> > > main (){} 
> > > gcc -If:/build/emacs-w32/include -If:/build/emacs-w32/include/libxml2 -g  
> > > -c junk.c -o junk.obj 
> > > gcc -If:/build/emacs-w32/include -If:/build/emacs-w32/include/libxml2 -g  
> > > -c junk.c -o junk.obj 
> > 
> > Though I don't know whether Emacs supports giflib-5.0.0, the below
> > patch can fix the problem.  Gif support on my binaries (built by gcc
> > 4.5.2, MinGW) has no problem with giflib-5.0.0 as far as I tested.
> > 
> > === modified file 'nt/configure.bat'
> > --- nt/configure.bat        2012-09-08 11:20:32 +0000
> > +++ nt/configure.bat        2012-09-18 03:14:43 +0000
> > @@ -627,7 +627,8 @@
> >  if (%gifsupport%) == (N) goto gifDone
> >  
> >  echo Checking for libgif...
> > -echo #include "gif_lib.h" >junk.c
> > +echo #include "stdio.h" >junk.c
> > +echo #include "gif_lib.h" >>junk.c
> >  echo main (){} >>junk.c
> >  rem   -o option is ignored with cl, but allows result to be consistent.
> >  echo %COMPILER% %usercflags% %mingwflag% -c junk.c -o junk.obj >>config.log
> 
> Does it work to use stddef.h instead of stdio.h?  stddef.h is where
> size_t is normally defined.

Yes, stddef.h also works.  I didn't care where size_t is defined.

-- 
Kazuhiro Ito